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EM78P468N/EM78P468L
8-Bit Microcontroller
20 •
Product Specification (V1.5) 02.15.2007
(This specification is subject to change without further notice)
6.2.15 IOC81/WDTCR (WDT Control Register)
(Address: 08h, Bit 0 of R5 = “1”)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
− − − − WDTE WDTP2 WDTP1 WDTP0
Bits 7 ~ 4: Not used
Bit 3 (WDTE): Watchdog timer enable. This control bit is used to enable the Watchdog
timer,
WDTE = “0”: Disable WDT function
WDTE = “1”: enable WDT function
Bits 2 ~ 0 (WDTP2 ~ WDTP0): Watchdog Timer prescaler bits. The WDT clock source
is sub-oscillation frequency.
WDTP2 WDTP1 WDTP0 WDT Rate
0 0 0 1:1
0 0 1 1:2
0 1 0 1:4
0 1 1 1:8
1 0 0 1:16
1 0 1 1:32
1 1 0 1:64
1 1 1 1:128
6.2.16 IOC91/CNT12CR (Counters 1, 2 Control Register)
(Address: 09h, Bit 0 of R5 = “1”)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
CNT2S CNT2P2 CNT2P1 CNT2P0 CNT1S CNT1P2 CNT1P1 CNT1P0
Bit 7(CNT2S): Counter 2 clock source select 0/1 → Fs/ Fm*
(*Fs: sub-oscillator clock, Fm: main-oscillator clock)
Bits 6~4 (CNT2P2 ~ CNT2P 0): Counter 2 prescaler select bits
CNT2P2 CNT2P1 CNT1P0 Counter 2 Scale
0 0 0 1:2
0 0 1 1:4
0 1 0 1:8
0 1 1 1:16
1 0 0 1:32
1 0 1 1:64
1 1 0 1:128
1 1 1 1:256